Clinical Reproductive Physiology of Ewes

Rawlings, N.C.; Bartlewski, Pawel M.

doi:10.1016/b978-072169323-1.50090-8

Cited by 7 publications

(14 citation statements)

References 21 publications

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“…The ewes of the FGA-PGF and control groups that had progesterone concentrations above 3 ng/ml were still cycling at the time of the experiment. During late winter and early spring, an interval of progestin administration followed by treatment with gonadotropins induces estrus in most ewes (Rawlings and Bartlewski 2007). Estradiol and progesterone concentrations reported in this study are typical of those reported in ewes in the transitionalanestrus period after estrus induction (Rawlings and Bartlewski 2007).…”

Section: Discussionsupporting

confidence: 65%

“…During late winter and early spring, an interval of progestin administration followed by treatment with gonadotropins induces estrus in most ewes (Rawlings and Bartlewski 2007). Estradiol and progesterone concentrations reported in this study are typical of those reported in ewes in the transitionalanestrus period after estrus induction (Rawlings and Bartlewski 2007). Abrupt introduction of rams to ewes in the transitional period to anestrus is usually followed by ovulation and development of a corpus luteum, which either fails prematurely (about 4-to 6-day lifespan) or persist for the normal 14 days and is followed by a normal ovulatory estrus (Keisler 2007).…”

Section: Discussionmentioning

confidence: 99%

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The effect of estrus synchronization treatments on somatic cell count of transitional-anestrus Awassi ewes’ milk

Talafha

Lafi

Ababneh

2008

Trop Anim Health Prod

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An experiment was conducted to examine the effect of estrus synchronization protocols and steroid hormones concentrations on somatic cell count (SCC) of transitional-anestrus local-Damascus cross goats' milk. Fifty-six goats (2-4-year old) were randomly assigned to three groups: fluorogestone acetate (FGA, n = 19), FGA-Prostaglandin (FGA-PGF, n = 19) and control (n = 18) groups. Intravaginal sponge containing 40 mg FGA was inserted for 13 days and an injection of 600 IU equine chorionic gonadotropin (eCG) was administered for goats of FGA and FGA-PGF groups at the time of sponge removal (day 0). In addition, goats of FGA-PGF group were injected with 10 mg dinoprost tromethamine (PGF2alpha) on day 0. Five fertile local-Damascus cross bucks were turned-in with all goats on day 0. Blood and milk samples were collected from all goats on days -13 (beginning of experiment), -6, 0, 1, 2, 7, 13 and 20 (end of the experiment). Four-year old and second-parity goats had significantly higher (p < 0.05) SCC of both udder halves than 2- and 3-year old and first-parity goats, respectively. There was a significant effect (p < 0.05) for treatment and number of kids born in the last kidding season on SCC of both udder halves. Neither estradiol nor progesterone concentrations were correlated with SCC in goats in this experiment. The SCC of both udder halves and left udder halves in goats of the control and FGA groups, respectively, increased significantly (p < 0.05) after sponge removal and buck introduction when compared with day 0, with no differences in the FGA-PGF group. This increase in SCC of the control and FGA groups coincided with peak estrus behavior. However, SCC was far below the upper limit of the current standard for normal milk. In conclusion, induction of estrus with progestagen based programs and buck introduction may cause temporary significant increase in SCC. However, the SCC values during this period of temporary increase were still in the range of acceptable values for normal milk. With the current standards for SCC of 1,000,000/ml as legal limit for abnormal milk control programs in goats, estrus synchronization programs and the estrus status should not be considered when bulk-tank milk SCC is being investigated.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

The effect of estrus synchronization treatments on somatic cell count of transitional-anestrus Awassi ewes’ milk

Talafha

Lafi

Ababneh

2008

Trop Anim Health Prod

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“…Dexamethasone is an exogenous corticosteroid used to induce parturition by mimicking the natural fetal cortisol influx into maternal circulation (Ingoldby and Jackson, 2001). A single dose of 10-20 mg of dexamethasone given intramuscularly (Edey et al, 1985;Ingoldby and Jackson, 2001;Rawlings and Bartlewski, 2007;Menzies, 2007) is the common procedure to induce labour and can be given as early as day 137 of a 144-149-day gestation period (Kastelic et al, 1996;Ingoldby and Jackson, 2001). However, administration of dexamethasone before day 142 is generally avoided to promote increased fetal viability (Rawlings and Bartlewski, 2007;Menzies, 2007).…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 97%

“…Lambing occurs typically between 36 and 50 h after induction with dexamethasone (Rawlings and Bartlewski, 2007;Menzies, 2007). The variability in time from induction to the onset of labour has been attributed to a variety of factors.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…Induction of parturition in sheep is commonly done only if the breeding date is known within a 3-day window to avoid premature births (Rawlings and Bartlewski, 2007;Menzies, 2007). Dexamethasone is an exogenous corticosteroid used to induce parturition by mimicking the natural fetal cortisol influx into maternal circulation (Ingoldby and Jackson, 2001).…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

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Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Sir

Bartlewski

2010

Livestock Science

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Reproductive activity in the peninsular pronghorn determined from excreted gonadal steroid metabolites

2015

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Fecal hormone monitoring was employed to better define annual patterns of reproductive steroid metabolites from a breeding pair of peninsular pronghorn (Antilocapra americana peninsularis) maintained at the Los Angeles Zoo. Notably in the female, increased excretion of estrogen metabolites occurred during the breeding season (Jun-Aug), and a biphasic pattern in progestagen activity was measured during gestation. Of additional interest, a preterm increase in estrogen that continued for an additional 64 days post partum. Male androgen activity correlated with the female estrogen patterns, with a single successful copulation occurring during the breeding season; interestingly however, the male exhibited no reproductive behaviors during the female's preterm/post partum estrogen increase. These data are the first reproductive steroid profiles for the peninsular pronghorn and provide valuable insight that will aid efforts that link the species' reproductive physiology with conservation management.

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Clinical Reproductive Physiology of Ewes

Cited by 7 publications

References 21 publications

The effect of estrus synchronization treatments on somatic cell count of transitional-anestrus Awassi ewes’ milk

The effect of estrus synchronization treatments on somatic cell count of transitional-anestrus Awassi ewes’ milk

Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Reproductive activity in the peninsular pronghorn determined from excreted gonadal steroid metabolites

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